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Old 06-09-2007, 08:26 PM
ferret2 ferret2 is offline
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blast media vs nozzle size

Is there a rule of thumb for matching sandblast media vs blast nozzle diameter? I have both 3/32 and 1/8" diameter nozzles.

Thanks
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Old 06-10-2007, 08:54 AM
daveengelson daveengelson is offline
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Not an authority, believe compressor output, CFM, will dictate size nozzle and thus determine media size. I am limited to nozzle size because have a small shop compressor rated approx. 6.5 CFM @ 90psi. When I purchased the sandblaster also purchased some of seller's blasting media later found was too large, nozzle kept clogging up. Once I went to smaller media equipment worked great.

dave
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Old 06-10-2007, 11:40 AM
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cujo8 cujo8 is offline
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Quote:
Originally Posted by daveengelson
Not an authority, believe compressor output, CFM, will dictate size nozzle and thus determine media size. I am limited to nozzle size because have a small shop compressor rated approx. 6.5 CFM @ 90psi. When I purchased the sandblaster also purchased some of seller's blasting media later found was too large, nozzle kept clogging up. Once I went to smaller media equipment worked great.

dave
Dave is correct in that the compressor CFM will dictate which nozzle size to use, which in turn determines the size of the media. If you use too big of a nozzle on a small compressor the compressor will run all the time and still won't be able to keep up with the blast cabinet. This will eventually kill your compressor, since they are not intended for 100% duty cycle.

From: http://www.tptools.com

Q. What size nozzle and how much air do I need?
A. The nozzle and air jet size determines the air requirements. The air jet fits inside the power gun and controls the amount of air leading to the nozzle. Nozzles and air jets can be changed, depending on your air compressor. If you have a 3 HP compressor (7 cfm), your best choice is probably the small nozzle. If you have a 5 HP compressor (15-20 cfm), use a medium nozzle. For a 10 HP or larger compressor, use a large size nozzle. Remember, nozzles and air jets must be changed in sets (small with small, etc.) and are available in steel, ceramic and carbide.


Characteristics of Abrasives: Most abrasives are graded as to Sieve Size. A sieve is a utensil of wire mesh or closely perforated metal used for straining or sifting, and can be used to separate coarser abrasive from finer abrasive. As the abrasive is poured through the sieve, the larger particles remain. The sieve is rated by the number of openings per square inch, so the higher the number, the finer the mesh. Also, the higher the number, the finer the abrasive. If an abrasive is graded 60-80, it means that it will pass through a grade 60 mesh sieve. Coarser abrasives (lower numbers) normally cut faster and create less dust within the cabinet, however the finish can be so coarse that the surface being blasted is extremely rough. If intending to paint or do further preparation on the metal, it is better to use a finer abrasive, to save prep time later. In summary: higher mesh numbers mean finer finishes and slower cutting action. Lower numbers mean coarse finishes and faster cutting action. Experiment with various types and grades of abrasive until you select your "favorites".

In summary, for satisfactory operation when cabinet blasting or using any air tool requiring large amounts of air, please observe the following recommendations:

1. Change nozzles frequently -- consider going to a smaller size to save air, or using a long-wearing Carbide Nozzle which will maintain its orifice size for a longer period of time.

2. Do not blast continually. Take a break every 5 minutes to allow air compressor to cool.

3. If air compressor tank feels hot (warm is normal), and is running continually, stop operating the cabinet or air tool and allow compressor to cool. Otherwise, compressor will overheat and eventually break down. Compressors are not guaranteed against this condition.

4. Compressor must recycle normally on and off and run no more than 2/3 the time. No air compressor is designed for continual operation. Know the capacity of your compressor and the amount of air required for your air tools, and allow a 50% overload factor for best results. (Example: Tool requires 10 CFM air. You need 15 CFM as an overload factor.)

5. Use a minimum 3/8" ID air hose up to 25 ft, from air compressor to cabinet and remember to consider air pressure drop as illustrated in table below. Example: If using 25 feet of 1/4" ID air hose, at 60 lbs pressure, you will experience a pressure drop of 19 lbs, meaning you actually have 41 lbs working pressure.


Air Pressure Drop with 1/4" or 5/16" ID Air Hose

.
Pressure Drop (Loss)

.
Pressure Drop (Loss)

1/4" ID Air Hose

25 feet

50 feet

5/16" ID Air Hose

25 feet

50 feet

At 60 lbs pressure
19 lbs

31 lbs

At 60 lbs pressure
6 lbs

11 lbs

At 70 lbs pressure
22 lbs

34 lbs

At 70 lbs pressure
7 lbs

13 lbs

At 80 lbs pressure
25 lbs

37 lbs

At 80 lbs pressure
8 lbs

14 lbs

At 90 lbs pressure
29 lbs

39 lbs

At 90 lbs pressure
10 lbs

16 lbs

At 100 lbs pressure
33 lbs

42 lbs

At 100 lbs pressure
12 lbs

18 lbs

Metal piping is always preferred to air hose, as it allows the moisture-laden air to condense in the piping, where it can be removed later with the water separators.




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Old 06-10-2007, 04:05 PM
ferret2 ferret2 is offline
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Everyone thanks for your concern about cfm but believe me air volume is not the issue. I will ask again - what mesh size media is recommended for a 3/32 and 1/8 inch nozzle.
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Old 06-10-2007, 08:38 PM
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70 - 100 Mesh size is what I use in my blast cabinet. I usually use aluminum oxide with an 80 grit mesh size and occasionally I use glass bead with a 70-100 mesh size. I have used both with small and medium nozzle sizes and I have never had any trouble with nozzle plugging. Hope this helps.
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Old 06-10-2007, 08:38 PM
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